Landing: e6e3290cddbf
Project / Subsystem
gcc / middle-end
Date
2026-07-29
Author
Tamar Christina
Commit
e6e3290cddbf1da000bfc6fcd2a1e5a2b2cd27fb
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- middle-end
- patch_id
- —
- commit_hash
- e6e3290cddbf1da000bfc6fcd2a1e5a2b2cd27fb
- source_type
- github
- headline
- Fix COND_FMS foldings with corrected negation and masking.
- tldr
- Corrects issues in folding conditional fused multiply-subtract operations, improving optimization accuracy.
- author
- Tamar Christina
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • aarch64
- • sve
- • vectorization
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-29T00:00:00.000Z
This commit addresses errors in GCC’s middle-end optimization pass related to folding conditional fused multiply-subtract (COND_FMS) operations. Typos in the optimization patterns led to incorrect negation of values and missing masks, impacting the accuracy of FMA (Fused Multiply-Add) optimizations. The fix corrects these pattern errors and adds new test cases to ensure robustness, particularly for SVE (Scalable Vector Extension) on AArch64 architectures.